Improvement in magazine-stoves



Patented Jan. 26, 1875,

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'UNITED STATES PATENT OFFICE.

JOHN E. TALLMADGE, OF AUBURN, NEW YORK.

IMPROVEMENT IN MAGAZlN-STOVES.

Specitication forming part of Letters Patent No. 159,052, dated January 26, 1875; application filed June 22, 1874.

To all whom it may concern:

i: Beit known that I, JOHN E. TALLMADGE, of Auburn, in 'the county of Cayuga and State of New York, have invented certain new and useful Improvements in Magazine Base-Burning Stoves 5 and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this speci-` iication, in which- Figure 1 represents a vertical section through the stove. Figs. 2, 3, 4, and 5 represent, respectively, horizontal sections through the stove, taken at the dotted lines w x y z of Fig. l.

Similar letters of reference, where they occur in the several separate figures, denote like parts of the stove in all of the drawings.

My invention relates, rst, to a particular arrangement of controllable air-inlet and gasoutlet passages, by means of which the draft may be regulated, divided, made direct or circuitous, as may be desired; second, it relates to mechanism, in combination with the magazine, for breaking up or loosening the coal before it drops into the fire-pot; and third, it relates to combined convex and concave rolling grates, as will be explained.

rIo enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings.

The under plate, A, of the bottom section B of the stove, has a series of openings, c, through it, to admit air from below the stove, to supply combustion under certain circumstances, and to regulate the surrounding temperature by inciting currents of air in that direction. In this bottom section B is the ash-box C, commanded by a door, D, and outside of this ashbox or chamber O is a circular chamber, b, with which the openings a communicate, and outside of the chamber b there is an annular passage, E, communicating with the exit iiue or pipe F at the rear of the stove, and with the ash-chamber O in front, by the openings c, all

of which are within the outer surrounding case or jacket of the section B of the stove. The exit-iiue F is controlled by a damper at d. From the top of the chamber b a series of small openings, e, lead into an annular draft-space, f, in the next section G of the stove, which I term the fire-box section, and over the openings c is a movable circular rim, g, having a projecting handle or knob, h, by which it can be moved from the exterior. In or through this circular rim there are a series of holes, c', which, when matched with those c, open a free passage for draft into the space f, but which, when moved a short distance, cuts oftl such draft. In the section G of the stove is the lirebox or pot H, between which and the exterior casing of the section is the above-mentioned annular draft-space j'. The grate upon which the fuel is supported and burned is composed of a central, hollow, and partially concave cyl inder, I, and upon each side of it a similarly hollow but convex cylinder or roller, J, leavin g draft-space between and around said rollers or roller-grates. Airopenings j, from the exterior of the stove, lead into these roller-grates, and exit-openings therefrom conduct such air as it becomes heated from contact with the heated grates into thesuperincumbent fuel. The roller-grates are supported by hollow trunnions, and by means of a key, 7c, fitting the shank of the roller I, said roller can be oscillated from the exterior, and its motion through the intervening coal or products of combustion moves the side rollers J, and thus clears the grate of ashes. The rollers are cast with ribs upon their perimeters, to prevent them from burning out, and keep them from warping by the heat. Above the section G is the magazine-section, consisting of a magazine, K, for containing a supply of fuel, such as coal. Outside of the magazine is the outer jacket L of the stove, there being an intervening space, Z, between them. From the lower portion of this space Zan exit-pipe, M, controlled by a damper, m, leads into the exit pipe or flue F, to carry off the gases that rise therein from the burning fuel. It often happens that the coal in the magazine becomes clogged, packed, or cemented by the heat, sothat it does not always freely drop into the fire-pot. To avoid this, and to crush or loosen up the mass, I arrange in the lower part of the magazine crushers or stirrers N, which have rods or shafts ln, attached to them, and extending upward to near the top of the stove, and have upon their upper ends cogged segments o, with which internal cogged gear p, on an annular rim, q, meshes or works, and on this rim there is a projectionhandle, r, by ,which it can be oscillated, and through it the Crushers are moved to and fro, to loosen up the mass ot' coal. 'Ihe rim gis supported in or upon the top section O of the stove, Which section is covered 'by a removable top or top plate, s, through which the coal is introduced to the magazine, and under which opening there is a hopper, t, for guiding the coal into the magazine, and for shielding the Working segments and rim o p q.

When the door D is up, the damper m closed, the damper d open, and the air-holes e disclosed-by those t' in the rim g, then the draft is through a, b, e, z', and f, to and over the top of the irepot; thence down through the burn-V ing fuel, and carrying the gases with it passes into the ash-chamber C; tnence through the openings o into the annular space E, and into the exit-pipe F.

When the damper d and the holes e are closed, the damper m opened, and the door D removed, then the draft is direct into the ashchamber c; thence up through the burning coal, and the gases pass out through the pipeM into the exit-pipe F; or by closing the damper m and opening the damper cl, the draft Will go partially up through the burning coal, over the top of the tire-pot, down through the annular spacef into the chamber E, into Which chamber a portion of the draft may pass from the ash-chamber through the openings c, and thence to the exitpipe F; or, by partially opening or closing these avenues, the draft may be divided so as to be partially direct and partially indirect or circuitous, as may be desired. When the air that supports combustion passes up through f and over the top of the fire-box, thence down through the burning mass, it becomes highly heated, and promotes more intense combustion.

By making the openings j from the exterior into the interior of the roller-grates, the cool air entering therethrough prevents said grates from burning out or warping; and as the air Vbecomes heated it passes through the exitopenings, mingling With the gases that are drawn through the spaces between the rollergrates, and aids in burning or consuming said gases.

Having thus fully described my invention, What I claim is l. The combination of the air-passages a b e i f, With the tire-box H, ash-chamber U, and its opening c, and annular chamber E, for the purpose of introducing and heating the air that is to promote combustion, making a down- Ward draft through the burning coal into the ashchamber, thence into and through the chamber E to the exitpipe, as described and represented.

2. In combination with the magazine K, the crushers or stirrers N, as and for the purpose described and represented.

3. In combination with the hollow rollergrates I J, the central grate being concave and the side grates convex, for leaving the draft-openings between and around them of uniformpshape and sectional area, the openings j, from the exterior of the stove, for taking in cool air, and the exit-openings therefrom, to allow said air, as it becomes heated, to pass out and mingle With the gases to promote their combustion, substantially as described.

JoHN E. TALLMADGE.

Witnesses:

WARREN A. WORDEN, EDWARD S. ONGLEY. 

